Systems and methods for production of mixed fatty esters

a technology of fatty esters and mixtures, applied in the direction of transferases, biomass after-treatment, fuels, etc., can solve the problems of increasing the difficulty of acquisition and increasing the limit of the fuel sour

Inactive Publication Date: 2010-03-25
LS9 INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]In some aspects, the invention comprises a method of producing a fatty ester composition. The method can comprise selecting methanol as a first alcohol for an alcohol mixture, selecting a second alcohol for the alcohol mixture, providing the alcohol mixture to a fatty ester production host, and converting the alcohol mixture to a fatty ester composition using the fatty ester production host. The presence of methanol in the alcohol mixture results in a fatty ester having the following formula: B1COOA1. B1 is a carbon chain that is at least 6 carbons in length. A1 is an alkyl group of 1 carbon in length. In some embodiments, the fatty ester composition is biased to include more fatty esters having B1 selected from the group consisting of C16, C17, C18, and any combination thereof in comparison to a method where the only alcohol is ethan...

Problems solved by technology

Fuel sources are becoming increas...

Method used

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  • Systems and methods for production of mixed fatty esters
  • Systems and methods for production of mixed fatty esters
  • Systems and methods for production of mixed fatty esters

Examples

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example 1

Production Host Construction

[0492]The present example outlines various production hosts and methods of making them. An exemplary production host is LS9001. LS9001 was produced by modifying C41(DE3) from Overexpress (Saint Beausine, France) to knock-out the fadE gene (acyl-CoA dehydrogenase).

[0493]Briefly, the fadE knock-out strain of E. coli was made using primers YafV_NotI and Ivry_OI to amplify about 830 by upstream of fadE and primers Lpcaf of and LpcaR_Bam to amplify about 960 by downstream of fadE. Overlap PCR was used to create a construct for in-frame deletion of the complete fadE gene. The fadE deletion construct was cloned into the temperature-sensitive plasmid pKOV3, which contained a sacB gene for counterselection, and a chromosomal deletion of fadE was made according to the method of Link et al., J. Bact. 179:6228-6237, 1997. The resulting strain was not capable of degrading fatty acids and fatty acyl-CoAs. This knock-out strain is herein designated as E. coli (DE3, Δfad...

example 2

Additional Production Hosts

[0501]The present example outlines additional modifications that can be made to various production hosts.

[0502]The following plasmids were constructed for the expression of various proteins that are used in the synthesis of fatty acid derivatives. The constructs were made using standard molecular biology methods. The cloned genes were put under the control of IPTG-inducible promoters (e.g., T7, tac, or lac promoters).

[0503]The ‘tesA gene (thioesterase A gene accession NP 415027 without leader sequence (Cho and Cronanu, J. Biol. Chem., 270:4216-9, 1995, EC: 3.1.1.5, 3.1.2.-)) of E. coli was cloned into NdeI / AvrII digested pETDuet-1 (pETDuet-1 described herein is available from Novagen, Madison, Wis.). Genes encoding for FatB-type plant thioesterases (TEs) from Umbellularia californica, Cuphea hookeriana, and Cinnamonum camphorum (accessions: UcFatB1=AAA34215, ChFatB2=AAC49269, ChFatB3=AAC72881, CcFatB=AAC49151) were individually cloned into three different ...

example 3

Medium Chain Fatty Esters

[0508]Alcohol acetyl transferases (AATs, EC 2.3.1.84), which is responsible for acyl acetate production in various plants, can be used to produce medium chain length fatty esters, such as octyl octanoate, decyl octanoate, decyl decanoate, and the like. An AAT gene can be inserted into one of the production hosts described herein by the methods noted in the above examples.

[0509]As will be appreciated by one of skill in the art, fatty esters, synthesized from medium chain alcohol (such as C6 and C8) and medium chain acyl-CoA (or fatty acids, such as C6 and C8) have a relatively low melting point. For example, hexyl hexanoate has a melting point of −55° C. and octyl octanoate has a melting point of −18° C. to −17° C. The low melting points of these compounds make them good candidates for use as biofuels.

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Abstract

Disclosed herein are various embodiments regarding the production of mixed fatty esters. Disclosed herein are various embodiments regarding the use of mixed alcohol compositions for the production of fatty esters.

Description

REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of provisional application No. 61 / 089,806, filed Aug. 18, 2008.[0002]The following are hereby incorporated by reference in their entireties: WO2007136762, entitled Production of Fatty Acids and Derivatives Thereof; WO2008100251, entitled Modified Microorganism Uses Therefor; WO2008113041, entitled Process for Producing Low Molecular Weight Hydrocarbons from Renewable Resources; WO2008119082, entitled Enhanced Production of Fatty Acid Derivatives; WO2009009391, entitled Systems and Methods for the Production of Fatty Esters; and WO2009042950, entitled Reduction of the Toxic Effect of Impurities From Raw Materials by Extractive Fermentation.FIELD OF THE INVENTION[0003]The present disclosure relates generally to compositions and methods for producing mixtures of fatty esters.BACKGROUND[0004]Fuel sources are becoming increasingly limited and difficult to acquire. As a result, efforts have been directed to...

Claims

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Application Information

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IPC IPC(8): C10L1/19C12M1/00
CPCC10G2300/1014C10L1/026Y02E50/13C12P7/649C10L1/19Y02P30/20Y02E50/10C12P7/6458C12P7/62C12N9/1029C12N9/16C12P7/6436C12Y203/01086C12Y301/02
Inventor HU, ZHIHAOLEE, GRACE J.CAMERON, DOUGLAS C.
Owner LS9 INC
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